[Nix-dev] dist-upgrade? define channel declaratively?

[Matthew O'Gorman]

Hi

I started playing with nixos-containers and have been very pleased so
far.  I wanted to try running unstable in one, but haven't been able to
figure out how to do so.  I tried setting these in my configuration of
the container

system.stateVersion = "unstable";
system.defaultChannel = "https://nixos.org/channels/unstable";

but it didn't change anything on a nixos-rebuild switch --upgrade

How can one define and use channels in the config files?  How does
someone do a dist-upgrade from 15.09 to unstable?  Sorry if these are
dumb questions.  I can't seem to find answer in the manuals or in irc.

-- 
Matthew O'Gorman
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